* {
    margin: 0;
    padding: 0;
}

#score-input {
    margin-left: 50px;
    margin-top: 50px;
    margin-bottom: 50px;
}

.box {
    width: 400px;
    height: 400px;
    border: 1px solid blue;
    margin-left: 50px;
    // 相对定位
    position: relative;
    // 溢出隐藏
    overflow: hidden;

    .game {
        // 绝对定位
        position: absolute;
        left: 0;
        top: -50px;

        .row {
            display: flex;
            .col {
                width: 100px;
                height: 100px;
                border: 1px solid #808080;
                box-sizing: border-box;

                &.black {
                    background: black;
                }
            }
        }
    }
}
